20443430 has 48 divisors (see below), whose sum is σ = 44439840. Its totient is φ = 6632064.

The previous prime is 20443417. The next prime is 20443433. The reversal of 20443430 is 3434402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20443433) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24866 + ... + 25674.

It is an arithmetic number, because the mean of its divisors is an integer number (925830).

Almost surely, 2^20443430 is an apocalyptic number.

20443430 is an abundant number, since it is smaller than the sum of its proper divisors (23996410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20443430 is a wasteful number, since it uses less digits than its factorization.

20443430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861 (or 842 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 20443430 is about 4521.4411419369. The cubic root of 20443430 is about 273.4332059516.

Adding to 20443430 its reverse (3434402), we get a palindrome (23877832).

Subtracting from 20443430 its reverse (3434402), we obtain a triangular number (17009028 = T₅₈₃₂).

It can be divided in two parts, 204 and 43430, that added together give a palindrome (43634).

The spelling of 20443430 in words is "twenty million, four hundred forty-three thousand, four hundred thirty".